Electromagnet.



PATENTED JULY 2, 1907.

G. BAEHR. ELECTROMAGNET. APPLICATION FILED APR. 4, 1907.

UNITED STATES PATENT OFFICE.

GEORGE BAEHR, OF MCKEESPORT, PENNSYLVANIA, ASSIGNOR TO NATIONAL TUBECOMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

E LE CTROMAGNET.

Specification of Letters Patent.

Patented July 2, 1907.

To all whom it may concern:

Be it known that I, GEORGE BAEHR, of McKeesport, Allegheny county,Pennsylvania, have invented a new and useful Electromagnet, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, forming part of this specification, inwhich Figure 1 is a section of one form of magnet embodying myinvention; Fig. 2 is a section on the line IIII of'Fig. 1; and Fig. 3 isan end view of the magnet.

My invention has relation to the class of electro-magnets, and is moreparticularly designed to provide an electro-magnet for use in lifting orpulling various metal objects of magnetic character, such as rods,pipes, etc., in which operation the magnet is applied to the ends of thearticles to be drawn for the purpose of moving them in a horizontal orinclined plane. It is designed to provide a magnet of this characterhaving a magnetic surface of extended area, and so constructed andarranged that there will be substantially uniform distribution of thelines of magnetic force throughout the entire lifting face.

With this object in view, the invention consists in a magnet having itslifting face composed of a plurality of pole pieces of alternatingpolarity, and separated from each other by openings or air gaps ofrelatively small dimensions, whereby the ends of the pipes, rods, orother objects to be drawn or lifted will not enter such openings orspaces.

The invention also consists in the novel construction, arrangement andcombination of parts, all substantially as hereinafter described.

In the accompanying drawings, the numeral 2 designates the spool or coreportion of the magnet upon which the energizing coils 3 are placed, anysuitable number of such coils being employed according to the size andstrength of the particular magnet to be constructed. This spool or coreis secured between the check or side pieces 4 having projecting polarportions 5, each of -which carries a plurality of pole pieces 6. Thosepole pieces are arranged in two sets, one set being carried by each ofthe side pieces 4 and alternating with each other, so that the liftingface of the magnet is formed by these pole pieces of alternatingpolarity,

each pole piece being separated from its neighbor o neighbors by anintervening opening or air gap 7 of relatively narrow size. The numberof these pole pieces and their particular form will depend upon the sizeof the magnet and the particular purpose for which it is intended. Iprefer, however, to form them of straight parallel pieces, as shown.

I preferably hinge or pivot a clamping member 8 of magnetic material toone of the cheek pieces, as shown in Fig. 1, to assist in holding thepipes or other articles. To the other cheek piece is secured a support 9for the ends of the articles. I

By this construction, I am enabled to provide a magnet having a largearea of lifting surface throughout which there is a substantiallyuniform distribution of the lines of magnetic force. This enables themagnet to be used for simultaneously lifting or pulling a large numberof pipes, rods, or other objects of comparatively small cross-section,the air gaps between the pole pieces being sufficiently restricted toprevent the ends with an energizing coil between them, a plurality ofpolepieces carried by each of said checks, the pieces carried by onecheck alternating with those carried by the other cheek, said piecesbeing separated from each other by relatively narrow spaces;substantially as described.

3. An electro-magnet. comprising a core, parallel side pieces at theends of the core, and a plurality of pole pieces carried by each of saidside-pieces, and extending substantially parallel with the core,adjacent pole pieces being separated from each other and of alternatingpolarity; substantially as described.

' In testimony whereof, I have hereunto set my hand.

. GEORGE BAEIIR. Witnesses GEO. E. KIRK,

FRANK W. YOUNG.

